The Casita Maria Center for Arts and Education hosted Fiesta 2010 at the Mandarin Oriental last night. After cocktails, guests including Vogue’s Valerie Boster and Meredith Melling Burke and designers Francisco Costa and Christian Cota made their way to dinner in the ballroom, where red satin tablecloths and low lighting played up the evening’s sultry Latin vibe. Meanwhile, on the other side of the park, the New York Stem Cell Foundation honored Dorothy Lichtenstein at Rockefeller University. Chuck Close and Agnes Gund presented Lichtenstein with the NYSCF Humanitarian Award. And downtown, Charlotte Ronson hosted a dinner at new eatery, MPD, on Gansevoort Street. After the meal, cars arrived promptly at 9:30 p.m. to take the group en masse to brother Mark Ronson’s concert at Webster Hall for the post-party.